import java.io.*;
import java.util.*;

public class Example10_16 {
    public static void main(String args[]) {
        File file = new File("student.txt");
        Scanner sc = null;
        int count = 0;
        double sum = 0;
        try {
            double score = 0;
            sc = new Scanner(file);
            sc.useDelimiter("[^0123456789.]+");
            while (sc.hasNextDouble()) {
                score = sc.nextDouble();
                count++;
                sum = sum + score;
                System.out.println(score);
            }
            double aver = sum / count;
            System.out.println("平均成绩:" + aver);
        } catch (Exception exp) {
            System.out.println(exp);
        }
    }
}
